偏心结构自复位复合摩擦阻尼器平扭耦联震动控制振动台试验研究

Shaking table tests on eccentric structure with re-centering hybrid friction damper for horizontal-torsional coupled seismic response mitigation

研制开发了一种新型自复位形状记忆合金复合摩擦阻尼器(HSMAFD),该新型阻尼器由超弹性形状记忆合金丝和摩擦装置复合而成,并通过模型试验研究了新型阻尼器在循环荷载作用下的力学性能。制作了一个三层两跨单向偏心钢框架缩尺模型,进行了新型阻尼器偏心结构平动及扭转耦联震动反应振动台试验。考虑了不同考虑场地条件对结构地震反应的影响,对比分析了无控结构和装有新型阻尼器有控结构的震动反应。研究结果表明,新型超弹性形状记忆合金复合摩擦阻尼器对结构的平动及扭转角位移均有一定的控制效果,但场地条件对控制效果有较大的影响。

A new Hybrid Shape Memory Alloys Friction Damper( HSMAFD) was developed. The damper consists of pre-tensioned superelastic shape memory alloy wires and friction devices. Cyclic tension-compression test on the damper was carried out to obtain the hysteretic behavior of the damper. With the aim of assessing the effectiveness of HSMAFD in mitigating the horizontal-torsional coupled seismic response of eccentric structures,shaking table tests on a reducedscale eccentric steel frame model with and without HSMAFD were carried out. The steel frame model,having 3 stories and 2 spans,on a scale of 1: 4,was fabricated eccentrically. The effect of the site condition on the seismic response of the structure was considered and the seismic performance of the steel frame model with and without HSMAFD was compared. The experimental results indicate that the HSMAFD can effectively reduce the torsional seismic response as well as translational vibration response of unsymmetrical building; however,the location site type has significant effect on the seismic response of the building.